.main-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    overflow: hidden;
  }
  
  .main-container .main-content {
    position: absolute;
    width: 100%;
    top: 0;
    bottom: 60px;
  }
  
  .main-container .main-menu {
    position: absolute;
    bottom: 0;
    height: 60px;
    width: 100%;
    text-align: center;
  }
  .menu {
    color: #bbb;
    text-align: center;
    height: 60px;
    line-height: 60px;
    width: 100%;
    z-index: 9999;
  }
  .menu i {
    display: block;
    height: 45px;
    padding-left: 31%;
    font-size: 22px;
    line-height: 45px;
  }
  .menu div {
    height: 15px;
    line-height: 10px;
  }
  .menu.active {
    color: orange;
  }
  